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6020HRJ/8030J User's Manual
Table 4-1.
Troubleshooting (Continued)
Symptom
Motor runs away
Poor servo response or
output performance
System oscillates
Version 1.1
Possible Cause
- Reverse tach connection
- Open tach connection
- Improper scaling
- Defective amplifier
- Improper adjustments
- Improper set-up
- Improper motor
application
- Improper adjustments
- Improper motor
application
∇ ∇ ∇
Aerotech, Inc.
Maintenance and Repair
Procedure
Reverse tach connections to amplifiers
Check for absence of tach voltage at input to amplifier
Check scaling adjustments (Section 3.4.2.). If terminals
2 or 3 are used for the tach signal, adjust R9 or R12
CW.
The pre-amplifier may be latching up. Short terminals 6
and 8 (shutdown). If this corrects the problem, the per-
amplifier is defective. If the problem persists, the
power section is probably defective.
Verify current limit adjustment (Section 3.4.1.) is set
correctly.
Re-check gain adjustment (R22) - Section 3.4.2.
Is the amplifier being used in a proper application?
Check status of jumpers J1 – J4 (Section 3.2.).
Check contact connections to terminals 6, 7, and 8
(torque limits) – see Figure 3-1. Circuits should be
totally open circuited when torque limit is not
requested.
Verify that R18 is in place.
Make sure that the correct motor is being used with the
amplifier (Section 3.5.).
Re-check scaling and GAIN adjustments (Section
3.4.2.). First turn the gain adjustment (R22) CW. Next,
turn the tach scaling (either R9 or R13 depending on
tach connection) CW.
If adjustments do not resolve the oscillation, review the
motor specifications and verify that the amplifier is
being applied to the correct motor. If necessary, the
compensation components may have to be changed
(Section 3.5.).
4-3
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